Construction method of large basement assembled from periphery to center

The invention relates to the technical field of basement construction, in particular to a construction method of a peripheral-to-center assembly type large basement, which comprises the following steps of: firstly, excavating a foundation pit in a pre-construction site, and arranging a supporting system of the foundation pit along with excavation until the foundation pit is excavated to the elevation of a basement bottom plate; bottom plate cast-in-place construction is conducted at the bottom of the foundation pit; assembling a temporary steel structure near the edge of the foundation pit by using a crane so as to form an overhead construction platform above the bottom plate of the basement; after the construction platform is completed, a crane is used for hoisting basement structure prefabricated parts into the foundation pit for construction on the construction platform through grid holes of the construction platform; and after fabricated construction of the basement is completed, the temporary steel struc